Air Conditioner
LG
Updated Jul 18, 2026
LG AC CH44 Error — Outdoor Air Temperature Sensor Fault & Fix
CH44
LG · Air ConditionerCH44 means the outdoor ambient air temperature thermistor is faulty — open or short circui…
Quick answer
CH44 means the outdoor ambient air temperature thermistor is faulty — open or short circuit.
What CH44 means
The outdoor air sensor measures the ambient temperature outside. The control board uses this reading to adjust compressor speed, manage defrost cycles in heating mode, and decide operating limits. CH44 means this sensor has failed electrically.
How to fix it
What does the CH44 code mean?
CH44 is an outdoor unit ambient air temperature thermistor fault (open or short circuit).
Common causes
- Failed outdoor air thermistor
- Connector loose or corroded on the outdoor PCB
- Wire damage (UV degradation or rodent damage)
- Outdoor PCB fault (rare)
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How to fix the CH44 error
Power off
Switch the breaker off.
Locate the sensor
Usually mounted near the condenser coil air intake, shielded from direct sun.
Reseat the connector
Check at the outdoor PCB.
Measure resistance
Expect around 10 kOhm at 25 degrees C. Replace if open or zero.
Replace with correct part
Use weather-rated replacement wire.
Safety first: Isolate power before opening the outdoor electrical compartment.
Part you may need: Outdoor ambient temperature sensor (NTC thermistor)
Ensure the replacement sensor is not in direct sunlight — it should be in the shade of the unit casing for accurate readings.
Frequently asked questions
Will the AC work without CH44 fixed?
It may run in a degraded mode but heating defrost will not function correctly, and efficiency will be poor.
Can weather damage this sensor?
Yes — outdoor sensors are exposed to rain, sun, and temperature extremes. They degrade faster than indoor sensors.
✎ Written by
REZAUL Karim (Riad)
REZAUL Karim (Riad) is the founder of ErrFixHub and a hands-on electronics and home-appliance repair specialist with over 15 years of experience diagnosing and fixing air conditioners, washing machines, refrigerators, inverters and other household appliances. He built ErrFixHub to turn cryptic error codes into clear, step-by-step fixes anyone can follow — cross-checking every code against manufacturer documentation and real repair-bench experience.
